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4710c53d 1"""Test correct operation of the print function.\r
2"""\r
3\r
4# In 2.6, this gives us the behavior we want. In 3.0, it has\r
5# no function, but it still must parse correctly.\r
6from __future__ import print_function\r
7\r
8import unittest\r
9from test import test_support\r
10\r
11from StringIO import StringIO\r
12\r
13NotDefined = object()\r
14\r
15# A dispatch table all 8 combinations of providing\r
16# sep, end, and file\r
17# I use this machinery so that I'm not just passing default\r
18# values to print, I'm either passing or not passing in the\r
19# arguments\r
20dispatch = {\r
21 (False, False, False):\r
22 lambda args, sep, end, file: print(*args),\r
23 (False, False, True):\r
24 lambda args, sep, end, file: print(file=file, *args),\r
25 (False, True, False):\r
26 lambda args, sep, end, file: print(end=end, *args),\r
27 (False, True, True):\r
28 lambda args, sep, end, file: print(end=end, file=file, *args),\r
29 (True, False, False):\r
30 lambda args, sep, end, file: print(sep=sep, *args),\r
31 (True, False, True):\r
32 lambda args, sep, end, file: print(sep=sep, file=file, *args),\r
33 (True, True, False):\r
34 lambda args, sep, end, file: print(sep=sep, end=end, *args),\r
35 (True, True, True):\r
36 lambda args, sep, end, file: print(sep=sep, end=end, file=file, *args),\r
37 }\r
38\r
39# Class used to test __str__ and print\r
40class ClassWith__str__:\r
41 def __init__(self, x):\r
42 self.x = x\r
43 def __str__(self):\r
44 return self.x\r
45\r
46class TestPrint(unittest.TestCase):\r
47 def check(self, expected, args,\r
48 sep=NotDefined, end=NotDefined, file=NotDefined):\r
49 # Capture sys.stdout in a StringIO. Call print with args,\r
50 # and with sep, end, and file, if they're defined. Result\r
51 # must match expected.\r
52\r
53 # Look up the actual function to call, based on if sep, end, and file\r
54 # are defined\r
55 fn = dispatch[(sep is not NotDefined,\r
56 end is not NotDefined,\r
57 file is not NotDefined)]\r
58\r
59 with test_support.captured_stdout() as t:\r
60 fn(args, sep, end, file)\r
61\r
62 self.assertEqual(t.getvalue(), expected)\r
63\r
64 def test_print(self):\r
65 def x(expected, args, sep=NotDefined, end=NotDefined):\r
66 # Run the test 2 ways: not using file, and using\r
67 # file directed to a StringIO\r
68\r
69 self.check(expected, args, sep=sep, end=end)\r
70\r
71 # When writing to a file, stdout is expected to be empty\r
72 o = StringIO()\r
73 self.check('', args, sep=sep, end=end, file=o)\r
74\r
75 # And o will contain the expected output\r
76 self.assertEqual(o.getvalue(), expected)\r
77\r
78 x('\n', ())\r
79 x('a\n', ('a',))\r
80 x('None\n', (None,))\r
81 x('1 2\n', (1, 2))\r
82 x('1 2\n', (1, ' ', 2))\r
83 x('1*2\n', (1, 2), sep='*')\r
84 x('1 s', (1, 's'), end='')\r
85 x('a\nb\n', ('a', 'b'), sep='\n')\r
86 x('1.01', (1.0, 1), sep='', end='')\r
87 x('1*a*1.3+', (1, 'a', 1.3), sep='*', end='+')\r
88 x('a\n\nb\n', ('a\n', 'b'), sep='\n')\r
89 x('\0+ +\0\n', ('\0', ' ', '\0'), sep='+')\r
90\r
91 x('a\n b\n', ('a\n', 'b'))\r
92 x('a\n b\n', ('a\n', 'b'), sep=None)\r
93 x('a\n b\n', ('a\n', 'b'), end=None)\r
94 x('a\n b\n', ('a\n', 'b'), sep=None, end=None)\r
95\r
96 x('*\n', (ClassWith__str__('*'),))\r
97 x('abc 1\n', (ClassWith__str__('abc'), 1))\r
98\r
99 # 2.x unicode tests\r
100 x(u'1 2\n', ('1', u'2'))\r
101 x(u'u\1234\n', (u'u\1234',))\r
102 x(u' abc 1\n', (' ', ClassWith__str__(u'abc'), 1))\r
103\r
104 # errors\r
105 self.assertRaises(TypeError, print, '', sep=3)\r
106 self.assertRaises(TypeError, print, '', end=3)\r
107 self.assertRaises(AttributeError, print, '', file='')\r
108\r
109 def test_mixed_args(self):\r
110 # If an unicode arg is passed, sep and end should be unicode, too.\r
111 class Recorder(object):\r
112\r
113 def __init__(self, must_be_unicode):\r
114 self.buf = []\r
115 self.force_unicode = must_be_unicode\r
116\r
117 def write(self, what):\r
118 if self.force_unicode and not isinstance(what, unicode):\r
119 raise AssertionError("{0!r} is not unicode".format(what))\r
120 self.buf.append(what)\r
121\r
122 buf = Recorder(True)\r
123 print(u'hi', file=buf)\r
124 self.assertEqual(u''.join(buf.buf), 'hi\n')\r
125 del buf.buf[:]\r
126 print(u'hi', u'nothing', file=buf)\r
127 self.assertEqual(u''.join(buf.buf), 'hi nothing\n')\r
128 buf = Recorder(False)\r
129 print('hi', 'bye', end=u'\n', file=buf)\r
130 self.assertIsInstance(buf.buf[1], unicode)\r
131 self.assertIsInstance(buf.buf[3], unicode)\r
132 del buf.buf[:]\r
133 print(sep=u'x', file=buf)\r
134 self.assertIsInstance(buf.buf[-1], unicode)\r
135\r
136\r
137def test_main():\r
138 test_support.run_unittest(TestPrint)\r
139\r
140if __name__ == "__main__":\r
141 test_main()\r